Our new Nerf Vulcan EBF-25 won't auto fire. We tried changing the batteries to several sets of new ones, but it still won't work. Any thoughts?

Clymer Motorcycle ATV Marine Snowmobile Tractor Shop Service Repair Manuals

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rcdodge posted the same problem on Aug 15, 2011. I've just posted a solution aginst his question, so try that (it's a bit tricky though).

Warning 1: this is a procedure for adults, not children - you may accidentally stab your own fingers.
Warning 2: this procedure might ruin the cocking bolt completely.
You'll need a small phillips head screw driver, two small flat-blade screw drivers, dental floss and four hands.
1) One end of the cocking bolt is fixed - leave this alone.
Remove the two screws from the inside face of the rotating end cap - this allows the outer cap to be removed.
The inner cap (still on the bolt) has four teeth that protrude into a recess around the metal bolt.
Warning 3: be extremely careful during the next step as the teeth may snap off completely and fingers could get hurt.
2) Using one of you four hands, hold the bolt upright on a sturdy table (with the fixed cap down) .
Simultaneously use the two flat-blade screw drivers to carefully lever one pair of opposite teeth out of the recess.
Whilst holding the levered the teeth out, firmly push the inner cap further down the bolt (down toward the fixed
end).
3) Wrap dental floss (or similarly stout, fine cord) around and around the recess to pack it out until it is flush with the outer diameter of the metal bolt - this is to stop the teeth locking back in place.
4) Slide the inner cap up and off.
Reassemble the cap.
Remove the dental floss.
Remind your son about the importance of reading the instructions first (just as you've always done yourself ;-).

Can you try wedging something in there to use as a lever, like a screw driver or a butter knife?

Have you checked the jamming inspection panel is pushed forward and the green light is on?

then your stator or regulator is bad on your bike.

I had the same problem with two guns out of the box. Turned out that the dividers in the battery tray kept the batteries from touching each other on some brands of batteries. Remove the dividers and should work. You can verify this by measuring the voltage on the two terminals of the battery pack.

There is a gray battery cover a little bit above the trigger. You will see a screw hole

The line to drain the gas tank or carb? If you have auto shut off fuel valves(vacuum) set the fuel valve to "prime"(or check owners manual about fuel system)
Some bikes need a fully charged battery to start sometimes.
Will the bike fire on starting fluid?
Spark plugs OK?
Can you get a 1/4 " spark at the plug.
Contact me if you need more info.
Eric

Have you tried opening the top latch? I know it locks with the chain in place but I am able to get mine open with some applied force. Also is the belt wedged? the belt can be pulled through with out harming the gearing. I have been trying to find more out about jamming solutions on the web and these suggestions are the only things I've read about. If this doesn't help perhaps Nerfhaven.com where hardcore Nerfers can tell you more.